Grinding machine



June 14, 1932. L L DE sMET GRINDING MACHINE Filed Sept. 9, 1929 .3 Sheets-Sheet l INVENTOR LllDeSmef I ATTORNEYS June 14, 1932.. l.. DE sMET GRINDING MACHINE Filed Sept. 9, 1929 5 Sheets-Sheet 2 5 L@ m mm R N O W e ...H my. A L. LY B WITNESSES June 14, 1932.` L. L. DE SMI-:T

GRINDING MACHINE FiledSept. 9, 1929 5 Sheets-Sheet ATTORN EYS PatentedY `lune 14, 1932 UNITED STATES isaasss LIEVIN LOUIS DE' SMET, OF HAWTHQRNE, NEV JERSEY GRINDENG MACHINE Application led September 9, 1929.

This invention relates to grinding machines, and has for an Object to provide an improved construction which will accurately and substantially automatically grind and straighten the edge of a knife.

Another object of the invention is to provide an improved construction for straightening and grinding comparatively long knives known in the cloth printing trade as a doc tor, the structure being such as to not only straighten the blade but grind the same at a desired angle evenly from one end to the other.

A further object, more specifically, is to l5 provide a grinding machine for blades which is adapted to be adjusted so that large or small blades may be ground in the same manner.

An additional object of the invention is to provide a grinding machine for blades, wherein the grinding member is maintained substantially in one place and the blade is moved back and forth across the grinding member.

In the accompanying drawings,-

Figure 1 is a side view of a blade grinding machine disclosing an embodiment of the invention;

Figure 2 is atop plan view of the structure shown in Figure 1 Figure 3 is a sectional view through Figure 1 approximately on the line 3 3, the same being on an enlarged scale;

Figure 4 is a fragmentary, sectional view through Figure 1 on the line 4 4, the same being on an enlarged scale;

Figure 5 is a longitudinal central vertical sectional view through the carriage shown in Figure l. f

Referring to the accompanying drawings by numerals, 1 indicates a frame and 2 suitable supporting legs. The frame 1 is shown somewhat in detail in Figure 3 and is bolted or otherwise secured to legs 2 and at the upper edge is provided with two guiding members 3 and 4. On the guiding members 3 and 4 is arranged a carriage 5 which is adapted to move back and forth past the grinding wheels 6 as the device functions so as to grind the blade 7.

In order to take care of dierent width Serial No. 391,423.

blades and different other conditions, the grinding wheels 6 may be moved upwardly and downwardly and also transversely, as shown in Fig. 3. The carriage 5 consists of a number of parts including heads 8 and 9 connected together by bars 10. Bars 10 are rigidly secured to head 9 and adjustably secured at the opposite end with the head 8. Suitable bolts extend through certain of the apertures 11 and into head 8 to connect the bars 10 to head 8, so that the heads 8 and 9 will be spaced a proper distance apart aocording to the length of the knife 7 to be ground. A rack 12 is bolted or otherwise rigidly secured to head 9 but is slidably connected with head 8. rl`his connection is through a bar 13 bolted or otherwise rigidly secured to rack 12 and slides in a notch 14 in head 8. Supporting plates 15 (Fig. 3)' hold bar 13 in place but allows the same to slide back and forth. A bracket 16 is bolted or otherwise secured to each of the heads 8 and 9, said brackets being` shown in end view in Fig. 3, and from this figure it will be seen that the brackets have a V -shaped supporting socket 17 for supporting the rounded end 18 of the back 19 of blade 7. Fach of the heads 8 and 9 is provided with an arc-shaped socket 20, and in each of these sockets there is positioned a supporting block 21. Each of these blocks is provided with graduations 22 coacting with the graduation 23 Fig. 3) carried by the head 8. Each of the blocks 21 is provided with a notch which is preferably larger than the back 19, so that this back may be .mounted therein and clamped in position by a clamping screw 25. When the blade 7 is first placed in position the ends 18 are mounted in the respective sockets 17, and then the blade is turned to a vertical position, after which the respective screws 25 are tightened. The grinding wheel 6 is then caused to func tion and as it functions the upper or scraping edge of blade 7 will be straightened. After this has been done the machine is stopped and the screws loosened, after which the blocks 21 and the blade are swung to the right or left, as shown in dotted lines in Fig. 3 and then the screws again tightened. After this has been done the grinding wheel 6 is ad- 100 justed, as hereinafter fully described, until it assumes the dotted position shown in Fig. 3. It is then ready to grind a desired edge onto the blade. The blade 7 shown in the accompanying drawings is part of the knife commonly known as a doctor in certain cloth printing trades. This blade or knife nust be ground with an edge having aV certain bevel in order to properly scrape paint or ink 01T a printing roll. For this reason it is extremely important thatthe'edge be straight and also be given the desired bevel for its full length. After the edge has been straightened as above described the blocks 2l are swung over to the desired angle, and: this angleis indicated by the graduations 22 and 23.

In order that the carriage 5 may be moved back and forth past the grinding rwheel 6, certain mechanism is provided shown particularly in Figs. 3 and 4. From these figures it will be seen that the rack 12 is continually in mesh with the gea-r wheel 26, and this Oear wheel is continually in mesh with pinion 27 rigidly secured to shaft 28. The hand wheel 29 is connected with shaft 28, whereby the parts may be actuated by the hand wheel and the carriage adjusted thereby. Ifdesired, the carriage could be moved back and forth by the hand wheel, but preferably, an electric motor 30 is connected with the gear wheel 26 for moving the carriage back and forth during the operation of the machine. The motor 30 is provided with=V a shaft 31 connected to the armature thereof, and this shaft carries a worm 32 continually meshing with the worm wheel 33. `Worm wheel: 33'is rigidly secured* by a key or otherwise to the shaft 34 carried in suitable journall boxes supported by the fra-me l. Facing beveled pinions 36 and 36v are loosely mounted on the shaft 34, said gears being spaced a suflicient distance apart to permit a double clutch 37 to be mounted therebetween andl to be normally held out of contact therewith. Each of the beveled gears 35 and 36 is provided with a clutch face, so that when the clutch 37 is shifted in either direction it will' engage one or the other of the beveled gears. Clutch 37 is splined on shaft 34 and rotates therewith so that when the clutch 37 has been shifted over to engagement with one of the beveled gears and motor 30 is functioning power will be transmitted from the engaged beveled gear to the beveled gear 33, and thence to shaft 3S) to which beveledgear 38 is rigidly secured. Gear 26 is pinned or otherwise rigidly secured to shaft 39 so that as this shaft rotates gear 26 will be rotated and the carriage will be moved along over the frame l. In order to properly control the clutch 37, a clutch arm 40 is provided, said. arm having a yoke or fork 4l fitting into the annular groove 42 of clutch 37, so that when the arm 40 is shifted in one direction the clutch will be moved accordingly, and when shifted in the opposite direction the clutch will be moved in the opposite direction to a neutral position or to engage the opposite beveled gear. Arm 40 is pinned or otherwise rigidly secured to a rock shaft 43, and this rock shaft carries a manually actuated arm 44. Arm 44 carries a tubular member 45 having an aperture through which the pin 4'6- projects. A spring 47 presses against pin 46 so as to normally hold the same in an outer position. "Vhen pin, 46- isl engaging. the central notch 48 the clutch 37 will be in a neutral position, andl when engaging one of the side notches adjacent notch 48 will be engaging either one or'the other of theV gear wheels 35 and 36. When the carriage has been moved past the grinding wheel 6, the stop'l strikes against the lever 44, whereby clutch 37 is shift-ed and thereby the carriage is caused to move in the opposite direction. Vhen the carriage moves to its opposite, extreme position the opposite stop 61 will'v strike lever 44 and. swingthe same back, whereby the driving mechanism is reversed and the carriage moves again in a reverse direction. By reason of this arrangement the carriage automatically is reversed and is moved back and forth continually as long as current is turned on to the electric motorr30. This back and forth-1novement will cause blade 7` to pass beneath the e grinding wheel and be ground thereby to a desired angle. Sometimes it is only necessary to move the carriage once past the grinding wheel 6, but when desiredthe automatic structure may be caused to function to reverse the carriage so that i-t will moveback` and forth as often as desired. In addition, it evident that the arm 44 could be operated manually so as to reverse the carriage, whenever desired.

In order that the grinding wheel 6 may operate as shown in Fig. 3 andv also operate in dierent other positions, as for instance, the positions shown in dotted lines in Fig. 3, a suitable adjusting mechanism has been provided for the wheel 6. The wheel: 6 is rigidly secured to shaft 49, and shaft 49 in turn is secured to the armature of motor 50. This motor is mounted on a suitable slide 5l of a conventional structure, said slide bcing operated by the screw shaft 52 caused to function by the hand' wheel 53. The slide 5l is mounted on a verticalv slide 54 guided by suitable guideways 55 in the bracket 56. A suitable screw 57 is operatively associated withV the slide or block 54 and is actuated by a hand wheel 58. The hand wheel 58 andv associated parts give the slide or block 5l an up and down movement and the motor 50 is slid back and forth with the slide or block 5l upon the actuation of the wheel 53. In this way the wheel 6 may be moved back and forth horizontally and also may be moved vertically, whereby the same may operate on different sized blades and also on the LSU lll)

blades when in different positions. From Fig. 3 it will be noted that the clamping members 59 act by reason of the screws 60 to clamp the blocks 21 in place and against movement. When it is desired to move block 21 screws 60 must be loosened and then the block will be rocked or rotated to the desired positions. Afterwards screws 60 are tightened and the block is locked against movement.

After the parts have been properly assembled and the machine is in condition for work, the operation of sharpening a blade is very simple. Usually it is desirable to operate the hand wheel 58 to raise the grinding wheel 6 to a position out of the way. The blade 7 is then placed in position, as illustrated in Figures l, 2 and 3. Before the blade is placed in position the blocks 21 in each head are shifted until the Zero mark or graduation 22 on the blocks is opposite the Zero mark on the stationary part of the head, whereby the slot 24 will be facing directly upward. After the blocks 21 have thus been adjusted the blade 7 is placed in position so that the rounded ends 18 are placed in the members 16 and the back 19 is loosely iitted into the opening 24. Set screw 25 on each block 21 is then tightened for clamping the back 19 lirmly against one wall of the opening 24, as shown in Figure 3. This will hold blade 7 in a vertical position. The hand Wheel 8 is then operated and the grinding wheel 6 lowered until it touches the highest point on blade 7. The device may then be operated by hand or by power to cause the carriage to move back and forth. Preferably power is used as the carriage may be moved faster in this manner. After the first one or two movements the handwheel' 58 is operated slightly to lower wheel 6 a little more and thereby grind a little more from the edge of the blade. This action is continued until the edge of the blade i' is perfectly straight. Villen a straight edge has been secured the handwheel 58 is operated for raising the wheel 6 and the carriage is stopped.

It will be understood, of course, that during the operation just described the power is turned on to the motor so that the grinding wheel 60 rotating preferably at a high rate of speed. After the blade 7 has been provided with a straight edge as just described, the clamping screw 60 on each head is loosened and the respective blocks 21 are partly rotated until the blade 7 is moved to the desired angle as, for instance, the angle indicated by dotted lines in Fig. 3. After this angle has been secured and both blocks 21 properly aligned through the use of the graduation 22, screws 60I are again tight ened for clamping the blocks against movement. Hand wheel 58 is then operated for shifting the wheel 6 and associated parts to one of the dotted positions shown in Figures 3 and 6. I-Iand wheel 58 is operated for lowering the grinding wheel and associated parts until it barely touches the blade. The motor 30 is then started and the carriage is moved back and forth thereby. During the back and forth movement the hand wheel 58 is operated slightly to grind more and more until the proper edge has been secured. l/Vhere knives are used as doctors, as above set forth, one edge only is ground, but if knives for other purposes are to be ground a bevel may be ground on each side of the edge. By this method of grinding a straight edge is secured irst and then the desired Vsharpness or bevel is secured.

What I claim is l. A blade grinding machine, including a reciprocating carriage, said carriage being adjustable as to length for receiving blades of different lengths, means for locking said carriage against accidental longitudinal adjustment, a pair of rocking blocks mounted on said carriage, a clamp carried by each block for clamping a blade therein, said blocks being rockable in a plane at right angles to the plane of movement of said carriage to adjust the blade to different angles, a grinding wheel for grinding said blade, and means for adjusting said grinding wheel horizontally and vertically, whereby when in one position the grinding wheel will straighten one edge of said blade and when in the second position will grind a bevel thereon.

2. In a grinding machine a grinding element, a carriage adapted to be moved back and forth past the grinding element, said carriage including a head at each end, each h-ead being formed with an arc-shaped socket, a block for each head, each block having an arc-shaped bottom and notches on the side opposite to said bottom, a clamping structure carried by each block for clamping a blade to the blocks in said notches, said blocks being rockable to vary the angle at which the blade Ineets the grinding element, means for clamping the blocks in said heads against accidental movement, and means for moving the carriage back and forth past said grinding element.

3. A blade grinding machine including a grinding element, a carriage for moving a blade past said grinding element, said carriage being adjustable as to length, a rack rigidly secured to said carriage at one end and slidably connected with the carriage at the opposite end, and means for reciprocating said carriage.

4. In a grinding machine for grinding blades, a grinding element, a carriage adapted to receive a blade and move the same past the grinding element, said carriage being adjustable as to length, a rack rigidly secured to one part of said carriage and slidably secured to the other part, a gear wheel lili) constantly meshing with said rack, and a plurality of independent mechanisms for aotuating said gear Wheel, said mechanism including a power driven mechanism and a hand driven mechanism.

5. In a grinding machine for grinding blades, a grinding element, a carriage for receiving a blade and moving the same past said grinding element, said carriage being provided With a head at each end, and conneoting bars for connecting said heads, said connecting bars being adjustable in respect to one of said heads for varying the length of said carriage, eaoh of said heads having a blade receiving slot and a clamping bolt for clamping the blade in said slot.

LIEVEN LOUIS DE SMET. 

